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<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>返回文件路径的信息</title>
 </head>
 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.pathinfo" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">pathinfo</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.3, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pathinfo</span> &mdash; <span class="dc-title">返回文件路径的信息</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.pathinfo-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>pathinfo</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$path</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$options</code><span class="initializer"> = PATHINFO_DIRNAME | PATHINFO_BASENAME | PATHINFO_EXTENSION | PATHINFO_FILENAME</span></span>
  ] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>

  <p class="para rdfs-comment">
   <span class="function"><strong>pathinfo()</strong></span> 返回一个关联数组包含有 <em>path</em>
   的信息。返回关联数组还是字符串取决于 <code class="parameter">options</code>。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.pathinfo-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">path</code></dt>

     <dd>

      <p class="para">
       要解析的路径。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">options</code></dt>

     <dd>

      <p class="para">
       如果指定了，将会返回指定元素；它们包括：<strong><code>PATHINFO_DIRNAME</code></strong>，<strong><code>PATHINFO_BASENAME</code></strong>
   和 <strong><code>PATHINFO_EXTENSION</code></strong> 或 <strong><code>PATHINFO_FILENAME</code></strong>。
      </p>
      <p class="para">如果没有指定 <code class="parameter">options</code> 默认是返回全部的单元。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.pathinfo-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   如果没有传入 <code class="parameter">options</code> ，将会返回包括以下单元的数组 <span class="type"><a href="language.types.array.html" class="type array">array</a></span>：<em>dirname</em>，<em>basename</em>
   和 <em>extension</em>（如果有），以 及<em>filename</em>。
  </p>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    If the <code class="parameter">path</code> does not have an extension, no
    <em>extension</em> element will be returned（以下第二个案例）。
   </p>
  </p></blockquote>
  <p class="para">
   If <code class="parameter">options</code> is present, returns a 
   <span class="type"><a href="language.types.string.html" class="type string">string</a></span> containing the requested element.
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.pathinfo-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.2.0</td>
       <td>
        添加了常量 <strong><code>PATHINFO_FILENAME</code></strong>。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.pathinfo-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2830">
    <p><strong>Example #1 <span class="function"><strong>pathinfo()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$path_parts&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">pathinfo</span><span style="color: #007700">(</span><span style="color: #DD0000">'/www/htdocs/inc/lib.inc.php'</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #0000BB">$path_parts</span><span style="color: #007700">[</span><span style="color: #DD0000">'dirname'</span><span style="color: #007700">],&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">$path_parts</span><span style="color: #007700">[</span><span style="color: #DD0000">'basename'</span><span style="color: #007700">],&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">$path_parts</span><span style="color: #007700">[</span><span style="color: #DD0000">'extension'</span><span style="color: #007700">],&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">$path_parts</span><span style="color: #007700">[</span><span style="color: #DD0000">'filename'</span><span style="color: #007700">],&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;&nbsp;</span><span style="color: #FF8000">//&nbsp;since&nbsp;PHP&nbsp;5.2.0<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
/www/htdocs/inc
lib.inc.php
php
lib.inc
</pre></div>
    </div>
   </div>
  </p>
  <p class="para">
   <div class="example" id="example-2831">
    <p><strong>Example #2 <span class="function"><strong>pathinfo()</strong></span> example showing difference between null and no extension</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$path_parts&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">pathinfo</span><span style="color: #007700">(</span><span style="color: #DD0000">'/path/emptyextension.'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$path_parts</span><span style="color: #007700">[</span><span style="color: #DD0000">'extension'</span><span style="color: #007700">]);<br /><br /></span><span style="color: #0000BB">$path_parts&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">pathinfo</span><span style="color: #007700">(</span><span style="color: #DD0000">'/path/noextension'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$path_parts</span><span style="color: #007700">[</span><span style="color: #DD0000">'extension'</span><span style="color: #007700">]);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
string(0) &quot;&quot;

Notice: Undefined index: extension in test.php on line 6
NULL
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.pathinfo-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    有关取得当前路径信息的说明，请阅读<a href="language.variables.predefined.html" class="link">预定义变量</a>一节。
   </p>
  </p></blockquote>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    <span class="function"><strong>pathinfo()</strong></span> is locale aware, so for it to parse a path 
    containing multibyte characters correctly, the matching locale must be set using 
    the <span class="function"><a href="setlocale.html" class="function">setlocale()</a></span> function.
   </p>
  </p></blockquote>
 </div>

 
 <div class="refsect1 seealso" id="refsect1-function.pathinfo-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="dirname.html" class="function" rel="rdfs-seeAlso">dirname()</a> - 返回路径中的目录部分</span></li>
    <li class="member"><span class="function"><a href="basename.html" class="function" rel="rdfs-seeAlso">basename()</a> - 返回路径中的文件名部分</span></li>
    <li class="member"><span class="function"><a href="parse_url.html" class="function" rel="rdfs-seeAlso">parse_url()</a> - 解析 URL，返回其组成部分</span></li>
    <li class="member"><span class="function"><a href="realpath.html" class="function" rel="rdfs-seeAlso">realpath()</a> - 返回规范化的绝对路径名</span></li>
   </ul>
  </p>
 </div>

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